diff --git a/React/Modules/RCTRedBox.m b/React/Modules/RCTRedBox.m
index 7d7b47b49ef2..c8003bc6d704 100644
--- a/React/Modules/RCTRedBox.m
+++ b/React/Modules/RCTRedBox.m
@@ -185,8 +185,9 @@ - (void)copyStack
 
 - (NSString *)formatFrameSource:(RCTJSStackFrame *)stackFrame
 {
+  NSString *fileName = RCTNilIfNull(stackFrame.file) ? [stackFrame.file lastPathComponent] : @"<unknown file>";
   NSString *lineInfo = [NSString stringWithFormat:@"%@:%zd",
-                        [stackFrame.file lastPathComponent],
+                        fileName,
                         stackFrame.lineNumber];
 
   if (stackFrame.column != 0) {