Only check version in main process (#1285)

Author: normanrz

webknossos/webknossos/__init__.py

@@ -35,5 +35,8 @@
 from .version import __version__ as current_version
 
 if not current_version == "0.0.0":
-    # Schedule the version check to run non-blocking in a background thread
-    check_version_in_background(current_version)
+    import multiprocessing
+
+    if multiprocessing.parent_process() is None:
+        # Schedule the version check to run non-blocking in a background thread
+        check_version_in_background(current_version)