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After upgrading 7.x-2.0-rc1 from beta4 I get the message :
Warning: Invalid argument supplied for foreach() in og_field_widget_form() (line 69 of /var/www/maket/sites/all/modules/og/includes/og.field.inc).
when creating group content using Entity reference prepopulate module and enabled "Prepopulate" in the field settings.
Creation is OK with or without select group in URL.