diff --git a/.gitea/workflows/prepare.yaml b/.gitea/workflows/prepare.yaml
index cc4684ae..4af8ce9f 100644
--- a/.gitea/workflows/prepare.yaml
+++ b/.gitea/workflows/prepare.yaml
@@ -25,7 +25,11 @@ jobs:
           git tag
           DATE=$(date +'%Y.%m.%d')
           TAG_COUNT=$(git tag -l "${DATE}.*" | wc -l)
-          BUILD_NUMBER=$(($TAG_COUNT + 1))
+          if [ "$TAG_COUNT" -eq 0 ]; then
+            BUILD_NUMBER=0
+          else
+            BUILD_NUMBER=$(($TAG_COUNT + 1))
+          fi
           
           VERSION_SUFFIX=${{ inputs.version_suffix }}
           if [ -n "$VERSION_SUFFIX" ] && [ "$VERSION_SUFFIX" = "dev" ]; then