diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c
index 99bd9f06..49a340c4 100644
--- a/ext/bigdecimal/bigdecimal.c
+++ b/ext/bigdecimal/bigdecimal.c
@@ -2845,6 +2845,7 @@ rb_cstr_convert_to_BigDecimal(const char *c_str, int raise_exception)
 static inline VALUE
 rb_str_convert_to_BigDecimal(VALUE val, int raise_exception)
 {
+    if (!raise_exception && memchr(RSTRING_PTR(val), '\0', RSTRING_LEN(val))) return Qnil;
     const char *c_str = StringValueCStr(val);
     return rb_cstr_convert_to_BigDecimal(c_str, raise_exception);
 }
diff --git a/test/bigdecimal/test_bigdecimal.rb b/test/bigdecimal/test_bigdecimal.rb
index 4487f4a4..b956b225 100644
--- a/test/bigdecimal/test_bigdecimal.rb
+++ b/test/bigdecimal/test_bigdecimal.rb
@@ -275,6 +275,12 @@ def test_BigDecimal_with_exception_keyword
     assert_nothing_raised(ArgumentError) {
       assert_equal(nil, BigDecimal(".", exception: false))
     }
+    assert_raise(ArgumentError) {
+      BigDecimal("1\0", exception: true)
+    }
+    assert_nothing_raised(ArgumentError) {
+      assert_equal(nil, BigDecimal("1\0", exception: false))
+    }
     assert_raise(ArgumentError) {
       BigDecimal("1", -1, exception: true)
     }