AssertionError when running with -s option

[sp-schoen]

The memory analyzer works well for me, except when I want to use the -s and -ss Options. Then I get the following error (debug output):

$ memory_analyzer run -s 2 --debug 25
Analyzing pid 25
Setting up GDB for pid 25
/usr/local/bin/python-dbg: No such file or directory.
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
0x00007f82a33c47b7 in epoll_wait (epfd=3, events=events@entry=0x562570a4d570, maxevents=1023, timeout=timeout@entry=1000) at ../sysdeps/unix/sysv/linux/epoll_wait.c:30
30      ../sysdeps/unix/sysv/linux/epoll_wait.c: No such file or directory.
+set directories /usr/local/lib/python3.7/site-packages/memory_analyzer/
+py sys.path.append("/usr/local/lib/python3.7/site-packages/memory_analyzer/")
++file_command /tmp/tmp02am_ttg/rendered_template-25.py.out
GIL $1
+++call (void) PyRun_SimpleString("with open('/tmp/tmp02am_ttg/rendered_template-25.py.out') as f: exec(f.read())")
[Detaching after fork from child process 161]
+++call (void) PyGILState_Release($1)
[Inferior 1 (process 25) detached]
Gathering data...
ERROR: AssertionError occurred during analysis: do not call blocking functions from the mainloop
ERROR: Failed with do not call blocking functions from the mainloop
^C
Aborted!