diff --git a/forge-1.18.2/src/main/java/org/dynmap/forge_1_18_2/DynmapPlugin.java b/forge-1.18.2/src/main/java/org/dynmap/forge_1_18_2/DynmapPlugin.java
index c950af23..aec39852 100644
--- a/forge-1.18.2/src/main/java/org/dynmap/forge_1_18_2/DynmapPlugin.java
+++ b/forge-1.18.2/src/main/java/org/dynmap/forge_1_18_2/DynmapPlugin.java
@@ -1797,6 +1797,7 @@ public class DynmapPlugin
         	if(!onblockchange) return;
         	BlockUpdateRec r = new BlockUpdateRec();
         	r.w = event.getWorld();
+            if(!(r.w instanceof ServerLevel)) return;  // band-aid to prevent errors in unsupported 'running in client' scenario
 			ForgeWorld fw = getWorld((ServerLevel)r.w, false);
 			if (fw == null) return;
 			r.wid = fw.getName();
diff --git a/forge-1.18/src/main/java/org/dynmap/forge_1_18/DynmapPlugin.java b/forge-1.18/src/main/java/org/dynmap/forge_1_18/DynmapPlugin.java
index 871e48b6..05cdbf63 100644
--- a/forge-1.18/src/main/java/org/dynmap/forge_1_18/DynmapPlugin.java
+++ b/forge-1.18/src/main/java/org/dynmap/forge_1_18/DynmapPlugin.java
@@ -1797,6 +1797,7 @@ public class DynmapPlugin
         	if(!onblockchange) return;
         	BlockUpdateRec r = new BlockUpdateRec();
         	r.w = event.getWorld();
+            if(!(r.w instanceof ServerLevel)) return;  // band-aid to prevent errors in unsupported 'running in client' scenario
 			ForgeWorld fw = getWorld((ServerLevel)r.w, false);
 			if (fw == null) return;
 			r.wid = fw.getName();