SyntaxError: source code cannot contain null bytes

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$ ./waf debian
  File "/home/user/Downloads/rkflashkit/./waf", line 166
    #BZh91AY&SY`|çÿÿÿ¾2tÿÿÿÿÿÿÿÿÿÿÿ
SyntaxError: source code cannot contain null bytes

Sources are straight after git clone.
OS: Ubuntu 24.04 (24.04.2 to be exact)

[faveoled]

Runs on Ubuntu 20.04