Index: src/test_multiplex.c
==================================================================
--- src/test_multiplex.c
+++ src/test_multiplex.c
@@ -327,11 +327,11 @@
   /* If JOURNAL_8_3_OFFSET is set to (say) 400, then any overflow files are 
   ** part of a database journal are named db.401, db.402, and so on. A 
   ** database may therefore not grow to larger than 400 chunks. Attempting
   ** to open chunk 401 indicates the database is full. */
   if( iChunk>=SQLITE_MULTIPLEX_JOURNAL_8_3_OFFSET ){
-    sqlite3_log(SQLITE_FULL, "multiplexed chunk overflow: %s", zName);
+    sqlite3_log(SQLITE_FULL, "multiplexed chunk overflow: %s", pGroup->zName);
     *rc = SQLITE_FULL;
     return 0;
   }
 #endif