diff --git a/FirebaseUI/Core/Implementation/FirebaseArray.m b/FirebaseUI/Core/Implementation/FirebaseArray.m
index 47f2218c3c4..8eebb931fa7 100755
--- a/FirebaseUI/Core/Implementation/FirebaseArray.m
+++ b/FirebaseUI/Core/Implementation/FirebaseArray.m
@@ -157,7 +157,9 @@ - (id)objectAtIndexedSubscript:(NSUInteger)index{
 }
 
 - (void)setObject:(id)obj atIndexedSubscript:(NSUInteger)index{
-	NSAssert(NO, @"Subscripting is read-only on FirebaseArray");
+  @throw [NSException exceptionWithName:@"FirebaseArraySetIndexWithSubscript"
+                                 reason:@"Setting an object as FirebaseArray[i] is not supported."
+                               userInfo:nil];
 }
 
 @end