Index: src/main.c
==================================================================
--- src/main.c
+++ src/main.c
@@ -1773,12 +1773,14 @@
 #ifdef SQLITE_ENABLE_API_ARMOR
   if( !sqlite3SafetyCheckOk(db) || pxTrace==0 || ppArg==0 ){
     return SQLITE_MISUSE_BKPT;
   }
 #endif
+  sqlite3_mutex_enter(db->mutex);
   *pxTrace = db->xTrace;
   *ppArg = db->pTraceArg;
+  sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
 /*
 ** Register a profile function.  The pArg from the previously registered 
 ** profile function is returned.  
@@ -1818,12 +1820,14 @@
 #ifdef SQLITE_ENABLE_API_ARMOR
   if( !sqlite3SafetyCheckOk(db) || pxProfile==0 || ppArg==0 ){
     return SQLITE_MISUSE_BKPT;
   }
 #endif
+  sqlite3_mutex_enter(db->mutex);
   *pxProfile = db->xProfile;
   *ppArg = db->pProfileArg;
+  sqlite3_mutex_leave(db->mutex);
   return SQLITE_OK;
 }
 #endif /* SQLITE_OMIT_TRACE */
 
 /*