diff --git a/src/computeDigestFragments.js b/src/computeDigestFragments.js
index dac121e..69801f5 100644
--- a/src/computeDigestFragments.js
+++ b/src/computeDigestFragments.js
@@ -25,7 +25,7 @@ function computeDigestFragments({
   const sortedCutsites = cutsites.sort((a, b) => {
     return a.topSnipPosition - b.topSnipPosition;
   });
-  if (!circular) {
+  if (!circular && cutsites.length) {
     sortedCutsites.push({
       id: "seqTerm_" + bsonObjectId().str,
       start: 0,
diff --git a/src/computeDigestFragments.test.js b/src/computeDigestFragments.test.js
index 869fedf..c03cab3 100644
--- a/src/computeDigestFragments.test.js
+++ b/src/computeDigestFragments.test.js
@@ -4,7 +4,7 @@ const {
 const aliasedEnzymesByName = require("./aliasedEnzymesByName");
 
 describe("computeDigestFragments", function() {
-  it.only("it should correctly generate fragments for bamhi cutting once in a circular sequence", function() {
+  it("it should correctly generate fragments for bamhi cutting once in a circular sequence", function() {
     const result = getDigestFragsForSeqAndEnzymes({
       sequence: "ggggatccggggggggggggggggggggggggggggggggggggggggg",
       circular: true,
@@ -41,4 +41,20 @@ describe("computeDigestFragments", function() {
     expect(result.fragments[1].size).toEqual(3);
     expect(result.fragments[1].madeFromOneCutsite).toEqual(false);
   });
+  it("it should not generate any fragments for bamhi if it doesn't cut in a linear sequence", function() {
+    const result = getDigestFragsForSeqAndEnzymes({
+      sequence: "ggggggggggggggggggggggggggggggggggggggggggggg",
+      circular: false,
+      enzymes: [aliasedEnzymesByName.bamhi]
+    });
+    expect(result.fragments).toHaveLength(0);
+  });
+  it("it should not generate any fragments for bamhi if it doesn't cut in a circular sequence", function() {
+    const result = getDigestFragsForSeqAndEnzymes({
+      sequence: "ggggggggggggggggggggggggggggggggggggggggggggg",
+      circular: true,
+      enzymes: [aliasedEnzymesByName.bamhi]
+    });
+    expect(result.fragments).toHaveLength(0);
+  });
 });