diff --git a/spec/git.spec.js b/spec/git.spec.js
index 0807598c..b54e5b32 100644
--- a/spec/git.spec.js
+++ b/spec/git.spec.js
@@ -240,5 +240,12 @@ describe('Git', function() {
 		);
 	});
 
+	it('will throw error if bad commits given to interactive test', function() {
+		expectTreeAsync(
+			'gc; git rebase HEAD~2 -i --interactive-test C2,C100; gc',
+			'{"branches":{"master":{"target":"C3","id":"master","remoteTrackingBranchID":null}},"commits":{"C0":{"parents":[],"id":"C0","rootCommit":true},"C1":{"parents":["C0"],"id":"C1"},"C2":{"parents":["C1"],"id":"C2"},"C3":{"parents":["C2"],"id":"C3"}},"tags":{},"HEAD":{"target":"master","id":"HEAD"}}'
+		);
+	});
+
 });
 
diff --git a/src/js/git/commands.js b/src/js/git/commands.js
index 4dc5abe9..2633efdd 100644
--- a/src/js/git/commands.js
+++ b/src/js/git/commands.js
@@ -590,8 +590,7 @@ var commandConfig = {
               interactiveTest: commandOptions['--interactive-test']
             }
           );
-        }
-        else {
+        } else {
           engine.rebaseInteractive(
             args[0],
             args[1], {
diff --git a/src/js/git/index.js b/src/js/git/index.js
index f61c67bd..ed3799e6 100644
--- a/src/js/git/index.js
+++ b/src/js/git/index.js
@@ -2139,7 +2139,9 @@ GitEngine.prototype.rebaseInteractiveTest = function(targetSource, currentLocati
     });
     
     if (extraCommits.length > 0) {
-      // What to do here?
+      throw new GitError({
+        msg: intl.todo('Hey those commits dont exist in the set!')
+      });
     }
   }