diff --git a/.github/workflows/flutter-build.yml b/.github/workflows/flutter-build.yml
index d2828b819..22b24d483 100644
--- a/.github/workflows/flutter-build.yml
+++ b/.github/workflows/flutter-build.yml
@@ -234,7 +234,7 @@ jobs:
           path: rustdesk
 
       - name: Sign rustdesk files
-        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != ''
+        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != '-2'
         shell: bash
         run: |
           pip3 install requests argparse
@@ -266,7 +266,7 @@ jobs:
           sha256sum ../../SignOutput/rustdesk-*.msi
 
       - name: Sign rustdesk self-extracted file
-        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != ''
+        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != '-2'
         shell: bash
         run: |
           BASE_URL=${{ env.SIGN_BASE_URL }} SECRET_KEY=${{ secrets.SIGN_SECRET_KEY }} python3 res/job.py sign_files ./SignOutput
@@ -400,7 +400,7 @@ jobs:
           path: Release
 
       - name: Sign rustdesk files
-        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != ''
+        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != '-2'
         shell: bash
         run: |
           pip3 install requests argparse
@@ -418,7 +418,7 @@ jobs:
           mv ./target/release/rustdesk-portable-packer.exe ./SignOutput/rustdesk-${{ env.VERSION }}-${{ matrix.job.arch }}-sciter.exe
 
       - name: Sign rustdesk self-extracted file
-        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != ''
+        if: env.UPLOAD_ARTIFACT == 'true' && env.SIGN_BASE_URL != '-2'
         shell: bash
         run: |
           BASE_URL=${{ env.SIGN_BASE_URL }} SECRET_KEY=${{ secrets.SIGN_SECRET_KEY }} python3 res/job.py sign_files ./SignOutput/