diff --git a/diff-sha.sh b/diff-sha.sh
index db09f0c97de..fbc2dc1a2b2 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -266,17 +266,16 @@ else
 
         # shellcheck disable=SC2086
         git fetch $EXTRA_ARGS -u --progress --deepen="$i" origin $TARGET_BRANCH $CURRENT_SHA 1>/dev/null 2>&1
+
+        if ((i > max_depth)); then
+          echo "::error::Unable to locate a common ancestor between $TARGET_BRANCH and $CURRENT_BRANCH with: $PREVIOUS_SHA$DIFF$CURRENT_SHA"
+          exit 1
+        fi
       done
-      
-      if ((i > max_depth)); then
-        echo "::error::Unable to locate a common ancestor between $TARGET_BRANCH and $CURRENT_BRANCH with: $PREVIOUS_SHA$DIFF$CURRENT_SHA"
-        exit 1
-      fi
     else
       echo "::debug::Not a shallow clone, skipping merge-base check."
     fi
   fi
-  
 
   echo "::debug::Target branch: $TARGET_BRANCH"
   echo "::debug::Current branch: $CURRENT_BRANCH"