diff --git a/Source/IGListKit/Internal/IGListSectionMap.m b/Source/IGListKit/Internal/IGListSectionMap.m
index 8ed8c1a7..ad94dace 100644
--- a/Source/IGListKit/Internal/IGListSectionMap.m
+++ b/Source/IGListKit/Internal/IGListSectionMap.m
@@ -95,7 +95,9 @@
 }
 
 - (NSInteger)sectionForObject:(id)object {
-    IGParameterAssert(object != nil);
+    if (object == nil) {
+        return NSNotFound;
+    }
 
     id sectionController = [self sectionControllerForObject:object];
     if (sectionController == nil) {