diff --git a/RELEASES.md b/RELEASES.md
index 0edb9cd641d8..44ee47f15519 100644
--- a/RELEASES.md
+++ b/RELEASES.md
@@ -10,6 +10,9 @@
 
 - Implemented an HTTP endponint returning the time that the language server has
   spent idle ([#1847](https://github.com/enso-org/enso/pull/1847)).
+- Fix a bug where the `project/list` endpoint would fail if any of the projects
+  referenced an edition that does not exist anymore
+  ([#1858](https://github.com/enso-org/enso/pull/1858)).
 
 # Enso 0.2.13 (2021-07-09)
 
diff --git a/docs/language-server/protocol-project-manager.md b/docs/language-server/protocol-project-manager.md
index 222d60b22226..217ec9482e25 100644
--- a/docs/language-server/protocol-project-manager.md
+++ b/docs/language-server/protocol-project-manager.md
@@ -101,8 +101,11 @@ interface ProjectMetadata {
   /**
    * Enso Engine version to use for the project, represented by a semver version
    * string.
+   *
+   * If the edition associated with the project could not be resolved, the
+   * engine version may be missing.
    */
-  engineVersion: String;
+  engineVersion?: String;
 
   /**
    * The last opened datetime.
diff --git a/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/data/ProjectMetadata.scala b/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/data/ProjectMetadata.scala
index 28e390dd7ccc..8dc92581559b 100644
--- a/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/data/ProjectMetadata.scala
+++ b/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/data/ProjectMetadata.scala
@@ -10,13 +10,14 @@ import nl.gn0s1s.bump.SemVer
   * @param name the name of the project
   * @param namespace the namespace of the project
   * @param id the project id
-  * @param engineVersion version of the engine associated with the project
+  * @param engineVersion version of the engine associated with the project, it
+  *                      may be missing if project's edition could not be loaded
   * @param lastOpened the last opened datetime
   */
 case class ProjectMetadata(
   name: String,
   namespace: String,
   id: UUID,
-  engineVersion: SemVer,
+  engineVersion: Option[SemVer],
   lastOpened: Option[OffsetDateTime]
 )
diff --git a/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/service/ProjectService.scala b/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/service/ProjectService.scala
index 71abf19fcdf1..9918b21e28bb 100644
--- a/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/service/ProjectService.scala
+++ b/lib/scala/project-manager/src/main/scala/org/enso/projectmanager/service/ProjectService.scala
@@ -2,6 +2,7 @@ package org.enso.projectmanager.service
 
 import akka.actor.ActorRef
 import cats.MonadError
+import com.typesafe.scalalogging.Logger
 import nl.gn0s1s.bump.SemVer
 import org.enso.editions.EnsoVersion
 import org.enso.pkg.Config
@@ -75,6 +76,8 @@ class ProjectService[
 )(implicit E: MonadError[F[ProjectServiceFailure, *], ProjectServiceFailure])
     extends ProjectServiceApi[F] {
 
+  private lazy val logger = Logger[ProjectService[F]]
+
   import E._
 
   /** @inheritdoc */
@@ -367,8 +370,8 @@ class ProjectService[
 
   private def resolveProjectMetadata(
     project: Project
-  ): F[ProjectServiceFailure, ProjectMetadata] =
-    for {
+  ): F[ProjectServiceFailure, ProjectMetadata] = {
+    val version = for {
       version <- resolveProjectVersion(project)
       version <- configurationService
         .resolveEnsoVersion(version)
@@ -378,10 +381,23 @@ class ProjectService[
             message
           )
         }
+    } yield version
+
+    for {
+      version <- version.map(Some(_)).recover { error =>
+        // TODO [RW] We may consider sending this warning to the IDE once
+        //  a warning protocol is implemented (#1860).
+        logger.warn(
+          s"Could not resolve engine version for project ${project.name}: " +
+          s"$error"
+        )
+        None
+      }
     } yield toProjectMetadata(version, project)
+  }
 
   private def toProjectMetadata(
-    engineVersion: SemVer,
+    engineVersion: Option[SemVer],
     project: Project
   ): ProjectMetadata =
     ProjectMetadata(
diff --git a/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/BaseServerSpec.scala b/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/BaseServerSpec.scala
index 325da2cd50fc..4dd99519e59a 100644
--- a/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/BaseServerSpec.scala
+++ b/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/BaseServerSpec.scala
@@ -12,10 +12,12 @@ import nl.gn0s1s.bump.SemVer
 import org.apache.commons.io.FileUtils
 import org.enso.distribution.FileSystem.PathSyntax
 import org.enso.distribution.{FileSystem, OS}
+import org.enso.editions.Editions
 import org.enso.jsonrpc.test.JsonRpcServerTestKit
 import org.enso.jsonrpc.{ClientControllerFactory, Protocol}
 import org.enso.loggingservice.printers.StderrPrinterWithColors
 import org.enso.loggingservice.{LogLevel, LoggerMode, LoggingServiceManager}
+import org.enso.pkg.{Config, PackageManager}
 import org.enso.projectmanager.boot.Globals.{ConfigFilename, ConfigNamespace}
 import org.enso.projectmanager.boot.configuration._
 import org.enso.projectmanager.control.effect.ZioEnvExec
@@ -350,4 +352,22 @@ class BaseServerSpec extends JsonRpcServerTestKit with BeforeAndAfterAll {
       ) shouldEqual json
   }
 
+  /** Modifies the project's package.yaml. */
+  def updateProjectConfig(
+    projectName: String
+  )(update: Config => Config): Unit = {
+    val pkgFile = new File(userProjectDir, projectName)
+    val pkg     = PackageManager.Default.loadPackage(pkgFile).get
+    pkg.updateConfig(update)
+  }
+
+  /** Sets project's parent edition. */
+  def setProjectParentEdition(
+    projectName: String,
+    newParentEditionName: String
+  ): Unit = updateProjectConfig(projectName) { config =>
+    config.copy(edition =
+      Some(Editions.Raw.Edition(parent = Some(newParentEditionName)))
+    )
+  }
 }
diff --git a/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/protocol/ProjectManagementApiSpec.scala b/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/protocol/ProjectManagementApiSpec.scala
index 5523eeda89b4..46acac546081 100644
--- a/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/protocol/ProjectManagementApiSpec.scala
+++ b/lib/scala/project-manager/src/test/scala/org/enso/projectmanager/protocol/ProjectManagementApiSpec.scala
@@ -1,9 +1,5 @@
 package org.enso.projectmanager.protocol
 
-import java.io.File
-import java.nio.file.Paths
-import java.util.UUID
-
 import io.circe.literal._
 import nl.gn0s1s.bump.SemVer
 import org.apache.commons.io.FileUtils
@@ -11,6 +7,9 @@ import org.enso.editions.SemVerJson._
 import org.enso.projectmanager.{BaseServerSpec, ProjectManagementOps}
 import org.enso.testkit.{FlakySpec, RetrySpec}
 
+import java.io.File
+import java.nio.file.Paths
+import java.util.UUID
 import scala.io.Source
 
 class ProjectManagementApiSpec
@@ -346,6 +345,37 @@ class ProjectManagementApiSpec
           """)
     }
 
+    "fail when project's edition could not be resolved" in {
+      implicit val client = new WsTestClient(address)
+      val projectId       = createProject("Foo")
+      setProjectParentEdition(
+        "Foo",
+        "some_weird_edition_name_that-surely-does-not-exist"
+      )
+
+      client.send(json"""
+            { "jsonrpc": "2.0",
+              "method": "project/open",
+              "id": 0,
+              "params": {
+                "projectId": $projectId
+              }
+            }
+          """)
+      client.expectJson(json"""
+          {
+            "jsonrpc":"2.0",
+            "id":0,
+            "error":{
+              "code" : 4011,
+              "message" : "Could not resolve project engine version: Cannot load the edition: Could not find edition `some_weird_edition_name_that-surely-does-not-exist`."
+            }
+          }
+          """)
+
+      deleteProject(projectId)
+    }
+
     "start the Language Server if not running" taggedAs Flaky in {
       //given
       val projectName     = "To_Remove"
@@ -633,6 +663,54 @@ class ProjectManagementApiSpec
       deleteProject(bazId)
     }
 
+    "return a list of projects even if editions of some of them cannot be resolved" in {
+      implicit val client = new WsTestClient(address)
+      //given
+      val fooId = createProject("Foo")
+      testClock.moveTimeForward()
+      val barId = createProject("Bar")
+      setProjectParentEdition(
+        "Bar",
+        "some_weird_edition_name_that-surely-does-not-exist"
+      )
+
+      //when
+      client.send(json"""
+            { "jsonrpc": "2.0",
+              "method": "project/list",
+              "id": 0,
+              "params": { }
+            }
+          """)
+      //then
+      client.expectJson(json"""
+          {
+            "jsonrpc":"2.0",
+            "id":0,
+            "result": {
+              "projects": [
+                {
+                  "name": "Bar",
+                  "namespace": "local",
+                  "id": $barId,
+                  "engineVersion": null,
+                  "lastOpened": null
+                },
+                {
+                  "name": "Foo",
+                  "namespace": "local",
+                  "id": $fooId,
+                  "engineVersion": $engineToInstall,
+                  "lastOpened": null
+                }
+              ]
+            }
+          }
+          """)
+      deleteProject(fooId)
+      deleteProject(barId)
+    }
+
     "returned sorted list of recently opened projects" in {
       implicit val client = new WsTestClient(address)
       //given