diff --git a/CHANGELOG.md b/CHANGELOG.md
index fb2e994f..f1f52e96 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,6 +21,8 @@ The changelog for `IGListKit`. Also see the [releases](https://github.com/instag
 
 - Ensuring view models with duplicate diff identifiers are removed when view models are first requested by `IGListBindingSectionController` [Adam Stern](https://github.com/adamastern) (tbd)
 
+- Log instead of assert for duplicate diff identifiers to make code testable. [Adam Stern](https://github.com/adamastern) (tbd)
+
 3.4.0
 -----
 
diff --git a/Source/Common/Internal/IGListArrayUtilsInternal.h b/Source/Common/Internal/IGListArrayUtilsInternal.h
index d6249fc6..2a18fa9c 100644
--- a/Source/Common/Internal/IGListArrayUtilsInternal.h
+++ b/Source/Common/Internal/IGListArrayUtilsInternal.h
@@ -25,7 +25,7 @@ static NSArray *objectsWithDuplicateIdentifiersRemoved(NSArray<id<IGListDiffable
             [identifierMap setObject:object forKey:diffIdentifier];
             [uniqueObjects addObject:object];
         } else {
-            IGFailAssert(@"Duplicate identifier %@ for object %@ with object %@", diffIdentifier, object, previousObject);
+            IGLKLog(@"Duplicate identifier %@ for object %@ with object %@", diffIdentifier, object, previousObject);
         }
     }
     return uniqueObjects;