diff --git a/tools/convert_tool/tensorflow/tf2tengine.cpp b/tools/convert_tool/tensorflow/tf2tengine.cpp
index 3658f9514..8bd20b2e2 100644
--- a/tools/convert_tool/tensorflow/tf2tengine.cpp
+++ b/tools/convert_tool/tensorflow/tf2tengine.cpp
@@ -2489,6 +2489,9 @@ int load_pad(TFNode* tf_node, TFGraph& tf_graph, ir_graph_t* graph, ir_node_t* n
 
     TFNode* input = tf_node->inputs[1];
     int* paddings = (int*)LoadConstParam(input);
+    if (!paddings) {
+        return -1;
+    }
     param->mode = 0;
     param->pad_0_h = paddings[0];
     param->pad_0_w = paddings[1];
@@ -2498,6 +2501,7 @@ int load_pad(TFNode* tf_node, TFGraph& tf_graph, ir_graph_t* graph, ir_node_t* n
     param->pad_2_w = paddings[5];
     param->pad_3_h = paddings[6];
     param->pad_3_w = paddings[7];
+    free(paddings);
     return 0;
 }