Fix the cannot read property range of null bug

1 files changed, 3 insertions, 1 deletions

diff --git a/packages/sol-tracing-utils/src/ast_visitor.ts b/packages/sol-tracing-utils/src/ast_visitor.ts
index 1ac9cd1de..27f19378b 100644
--- a/packages/sol-tracing-utils/src/ast_visitor.ts
+++ b/packages/sol-tracing-utils/src/ast_visitor.ts
@@ -89,7 +89,9 @@ export class ASTVisitor {
         this._visitStatement(ast);
     }
     public ExpressionStatement(ast: Parser.ExpressionStatement): void {
-        this._visitStatement(ast.expression);
+        if (!_.isNull(ast.expression)) {
+            this._visitStatement(ast.expression);
+        }
     }
     public InlineAssemblyStatement(ast: Parser.InlineAssemblyStatement): void {
         this._visitStatement(ast);