diff --git a/.github/workflows/flutter-nightly.yml b/.github/workflows/flutter-nightly.yml
index 466ad3d59..e1bd90593 100644
--- a/.github/workflows/flutter-nightly.yml
+++ b/.github/workflows/flutter-nightly.yml
@@ -156,7 +156,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Import the codesign cert
-        if: ${{ env.MACOS_P12_BASE64== 'true' }}
+        if: env.MACOS_P12_BASE64 != null
         uses: apple-actions/import-codesign-certs@v1
         with: 
           p12-file-base64: ${{ secrets.MACOS_P12_BASE64 }}
@@ -164,13 +164,13 @@ jobs:
           keychain: rustdesk
       
       - name: Check sign and import sign key
-        if: ${{ env.MACOS_P12_BASE64== 'true' }}
+        if: env.MACOS_P12_BASE64 != null
         run: |
           security default-keychain -s rustdesk.keychain
           security find-identity -v
 
       - name: Import notarize key
-        if: ${{ env.MACOS_P12_BASE64== 'true' }}
+        if: env.MACOS_P12_BASE64 != null
         uses: timheuer/base64-to-file@v1.2
         with:
           # https://gregoryszorc.com/docs/apple-codesign/stable/apple_codesign_rcodesign.html#notarizing-and-stapling
@@ -179,7 +179,7 @@ jobs:
           encodedString: ${{ secrets.MACOS_NOTARIZE_JSON }}
           
       - name: Install rcodesign tool
-        if: ${{ env.MACOS_P12_BASE64== 'true' }}
+        if: env.MACOS_P12_BASE64 != null
         shell: bash
         run: | 
           pushd /tmp
@@ -250,7 +250,7 @@ jobs:
           ./build.py --flutter ${{ matrix.job.extra-build-args }}
 
       - name: Codesign app and create signed dmg
-        if: ${{ env.MACOS_P12_BASE64== 'true' }}
+        if: env.MACOS_P12_BASE64 != null
         run: |
           security default-keychain -s rustdesk.keychain
           security unlock-keychain -p ${{ secrets.MACOS_P12_PASSWORD }} rustdesk.keychain