diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index b43b9e16..e2b11f47 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -13,6 +13,14 @@ jobs:
       uses: actions/setup-java@v1
       with:
         java-version: 16
+    - uses: actions/cache@v2
+      with:
+        path: |
+          ~/.gradle/caches
+          ~/.gradle/wrapper
+        key: "${{ runner.os }}-bluemap-${{ hashFiles('**/*.gradle*') }}"
+        restore-keys: |
+          ${{ runner.os }}-bluemap-
     - name: Build with Gradle
       run: ./gradlew clean test build
     - uses: actions/upload-artifact@v2
diff --git a/implementations/sponge-8.0.0/src/main/java/de/bluecolored/bluemap/sponge8/SpongePlayer.java b/implementations/sponge-8.0.0/src/main/java/de/bluecolored/bluemap/sponge8/SpongePlayer.java
index 8f8d08a2..12bf54e4 100644
--- a/implementations/sponge-8.0.0/src/main/java/de/bluecolored/bluemap/sponge8/SpongePlayer.java
+++ b/implementations/sponge-8.0.0/src/main/java/de/bluecolored/bluemap/sponge8/SpongePlayer.java
@@ -122,7 +122,7 @@ public void update() {
             Optional<List<PotionEffect>> effects = player.get(Keys.POTION_EFFECTS);
             if (effects.isPresent()) {
                 for (PotionEffect effect : effects.get()) {
-                    if (effect.type().equals(PotionEffectTypes.INVISIBILITY.get()) && effect.duration() > 0) invis = true;
+                    if (effect.type().equals(PotionEffectTypes.INVISIBILITY.get()) && effect.duration().ticks() > 0) invis = true;
                 }
             }
         }