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-rw-r--r--python/flatbuffers/builder.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/python/flatbuffers/builder.py b/python/flatbuffers/builder.py
index 3e7f3ceb..ed509704 100644
--- a/python/flatbuffers/builder.py
+++ b/python/flatbuffers/builder.py
@@ -350,6 +350,8 @@ class Builder(object):
def CreateString(self, s):
"""CreateString writes a null-terminated byte string as a vector."""
+ self.assertNotNested()
+
if isinstance(s, compat.string_types):
x = s.encode()
elif isinstance(s, compat.binary_type):