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-rw-r--r--sandbox/006-sandbox-copy.mu2
1 files changed, 1 insertions, 1 deletions
diff --git a/sandbox/006-sandbox-copy.mu b/sandbox/006-sandbox-copy.mu
index 4b7222f3..0eae6cf7 100644
--- a/sandbox/006-sandbox-copy.mu
+++ b/sandbox/006-sandbox-copy.mu
@@ -194,7 +194,7 @@ def find-sandbox env:&:environment, click-row:num -> result:&:sandbox [
     curr-sandbox <- get *curr-sandbox, next-sandbox:offset
     loop
   }
-  return 0/not-found
+  return null/not-found
 ]
 
 def click-on-sandbox-area? click-row:num, env:&:environment -> result:bool [