diff --git a/internal/shop.cm b/internal/shop.cm
index 4a9c5eb6..a9125229 100644
--- a/internal/shop.cm
+++ b/internal/shop.cm
@@ -949,9 +949,11 @@ function try_dylib_symbol(sym, pkg, file_stem) {
 
   var c_file = file_stem + '.c'
   var cpp_file = file_stem + '.cpp'
-  var entry = find(dylibs, function(r) {
+  var idx = find(dylibs, function(r) {
     return r.file == c_file || r.file == cpp_file
   })
+  if (idx == null) return null
+  var entry = dylibs[idx]
   if (!entry || !entry.dylib) return null
 
   var handle = open_dls[entry.dylib]