1 files changed, 4 insertions, 0 deletions
diff --git a/src/js_ast.zig b/src/js_ast.zig
index 42138301b..321c69c33 100644
--- a/src/js_ast.zig
+++ b/src/js_ast.zig
@@ -592,6 +592,10 @@ pub const Symbol = struct {
         symbols_for_source: [][]Symbol,
 
         pub fn get(self: *Map, ref: Ref) ?Symbol {
+            if (Ref.isSourceIndexNull(ref.source_index)) {
+                return null;
+            }
+
             return self.symbols_for_source[ref.source_index][ref.inner_index];
         }