diff --git a/engine/runtime/src/main/java/org/enso/interpreter/runtime/warning/Warning.java b/engine/runtime/src/main/java/org/enso/interpreter/runtime/warning/Warning.java
index b6025eb2abdc..cf862aa772a4 100644
--- a/engine/runtime/src/main/java/org/enso/interpreter/runtime/warning/Warning.java
+++ b/engine/runtime/src/main/java/org/enso/interpreter/runtime/warning/Warning.java
@@ -113,6 +113,11 @@ public Object toDisplayString(boolean enableSideEffects) {
     return toString();
   }
 
+  @ExportMessage
+  boolean isNull() {
+    return false;
+  }
+
   @CompilerDirectives.TruffleBoundary
   @Override
   public String toString() {