diff --git a/diff-sha.sh b/diff-sha.sh
index dc6c3a6c..cd31e541 100644
--- a/diff-sha.sh
+++ b/diff-sha.sh
@@ -205,7 +205,7 @@ else
       fi
     else
       PREVIOUS_SHA=$GITHUB_EVENT_PULL_REQUEST_BASE_SHA
-
+      
       if ! git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
         PREVIOUS_SHA=$(git merge-base "$PREVIOUS_SHA" "$CURRENT_SHA" 2>&1) && exit_status=$? || exit_status=$?
       fi
@@ -221,19 +221,18 @@ else
         max_depth=$INPUT_MAX_FETCH_DEPTH
 
         for ((i=0; i<max_depth; i+=depth)); do
-          echo "Fetching $depth commits..."
+          echo "Fetching $i commits..."
 
           # shellcheck disable=SC2086
-          git fetch $EXTRA_ARGS -u --progress --deepen="$depth" origin +"$GITHUB_REF":refs/remotes/origin/"$CURRENT_BRANCH"
+          git fetch $EXTRA_ARGS -u --progress --deepen="$i" origin +"$GITHUB_REF":refs/remotes/origin/"$CURRENT_BRANCH"
 
           if git diff --name-only --ignore-submodules=all "$PREVIOUS_SHA$DIFF$CURRENT_SHA" 1>/dev/null 2>&1; then
-            PREVIOUS_SHA=$(git merge-base "$TARGET_BRANCH" "$CURRENT_SHA" 2>&1) && exit_status=$? || exit_status=$?
             break
           fi
         done
 
         if ((i >= max_depth)); then
-          echo "::error::Unable to locate a common ancestor between $TARGET_BRANCH and $CURRENT_SHA"
+          echo "::error::Unable to locate a common ancestor between $TARGET_BRANCH and $CURRENT_BRANCH with: $PREVIOUS_SHA$DIFF$CURRENT_SHA"
           exit 1
         fi
       else