diff --git a/imm_ptl_core/src/main/java/qouteall/imm_ptl/core/render/optimization/SharedBlockMeshBuffers.java b/imm_ptl_core/src/main/java/qouteall/imm_ptl/core/render/optimization/SharedBlockMeshBuffers.java
index b04c62f27..cebc05500 100644
--- a/imm_ptl_core/src/main/java/qouteall/imm_ptl/core/render/optimization/SharedBlockMeshBuffers.java
+++ b/imm_ptl_core/src/main/java/qouteall/imm_ptl/core/render/optimization/SharedBlockMeshBuffers.java
@@ -93,7 +93,7 @@ private static void cleanup() {
     }
     
     public static String getDebugString() {
-        if (IPGlobal.enableSharedBlockMeshBuffers) {
+        if (IPGlobal.enableSharedBlockMeshBuffers && threadBuffers != null) {
             return "SharedBlockMeshBuffers " + Integer.toString(threadBuffers.size());
         }
         return "";