diff --git a/scripts/upload-sourcemaps.sh b/scripts/upload-sourcemaps.sh
index d790e674..e1fb8916 100755
--- a/scripts/upload-sourcemaps.sh
+++ b/scripts/upload-sourcemaps.sh
@@ -14,6 +14,11 @@ fi
 COMMIT_SHA="$(printf '%s' "${COMMIT_SHA}" | tr '[:upper:]' '[:lower:]')"
 RELEASE="shoc-frontend@${COMMIT_SHA}"
 
+if ! npm exec --no -- sentry-cli --version >/dev/null 2>&1; then
+  echo "sentry-cli is not in this SPA tree; skipping source-map upload"
+  exit 0
+fi
+
 npm exec --no -- sentry-cli sourcemaps upload \
   --org "${SENTRY_ORG}" \
   --project "${SENTRY_PROJECT}" \