diff --git a/mysql-test/suite/galera/r/MDEV-35946.result b/mysql-test/suite/galera/r/MDEV-35946.result
new file mode 100644
index 00000000000..1ebc88c1a48
--- /dev/null
+++ b/mysql-test/suite/galera/r/MDEV-35946.result
@@ -0,0 +1,16 @@
+connection node_2;
+connection node_1;
+connection node_1;
+connection node_2;
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=1';
+SET SESSION wsrep_sync_wait=0;
+SET SESSION wsrep_sync_wait=DEFAULT;
+DELETE FROM mysql.wsrep_streaming_log;
+ERROR HY000: Lock wait timeout exceeded; try restarting transaction
+SET SESSION wsrep_sync_wait=0;
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=0';
+SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+VARIABLE_VALUE
+Primary
+SET SESSION wsrep_sync_wait=DEFAULT;
+CALL mtr.add_suppression("WSREP: Protocol violation\\. JOIN message sender (.*) is not in state transfer \\(SYNCED\\)\\. Message ignored\\.");
diff --git a/mysql-test/suite/galera/t/MDEV-35946.test b/mysql-test/suite/galera/t/MDEV-35946.test
new file mode 100644
index 00000000000..23c3d463a48
--- /dev/null
+++ b/mysql-test/suite/galera/t/MDEV-35946.test
@@ -0,0 +1,41 @@
+#
+# MDEV-35946: Assertion `thd->is_error()' failed in Sql_cmd_dml::prepare
+#
+--source include/have_innodb.inc
+--source include/galera_cluster.inc
+
+# Save original auto_increment_offset values.
+--let $node_1=node_1
+--let $node_2=node_2
+--source include/auto_increment_offset_save.inc
+
+#
+# Disconnect from the cluster
+#
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=1';
+SET SESSION wsrep_sync_wait=0;
+--let $wait_condition = SELECT VARIABLE_VALUE = 'non-Primary' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+--source include/wait_condition.inc
+SET SESSION wsrep_sync_wait=DEFAULT;
+
+#
+# If bug is present, assertion will fire
+# during the execution of the following DELETE
+#
+--error ER_LOCK_WAIT_TIMEOUT
+DELETE FROM mysql.wsrep_streaming_log;
+
+
+#
+# Reconnect to the cluster
+#
+SET SESSION wsrep_sync_wait=0;
+SET GLOBAL wsrep_provider_options = 'gmcast.isolate=0';
+--let $wait_condition = SELECT VARIABLE_VALUE = 'Primary' FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+--source include/wait_condition.inc
+SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.GLOBAL_STATUS WHERE VARIABLE_NAME = 'wsrep_cluster_status';
+SET SESSION wsrep_sync_wait=DEFAULT;
+
+
+--source include/auto_increment_offset_restore.inc
+CALL mtr.add_suppression("WSREP: Protocol violation\\. JOIN message sender (.*) is not in state transfer \\(SYNCED\\)\\. Message ignored\\.");
diff --git a/sql/wsrep_mysqld.cc b/sql/wsrep_mysqld.cc
index c905883e2fb..974ddfc1d4c 100644
--- a/sql/wsrep_mysqld.cc
+++ b/sql/wsrep_mysqld.cc
@@ -1231,7 +1231,12 @@ bool wsrep_sync_wait (THD* thd, uint mask)
       This allows autocommit SELECTs and a first SELECT after SET AUTOCOMMIT=0
       TODO: modify to check if thd has locked any rows.
     */
-    return thd->wsrep_cs().sync_wait(-1);
+    if (thd->wsrep_cs().sync_wait(-1))
+    {
+      wsrep_override_error(thd, thd->wsrep_cs().current_error(),
+                           thd->wsrep_cs().current_error_status());
+      return true;
+    }
   }
 
   return false;