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Posted a reply to there was a null error sending your notification, on the site WordPress.org Forums:
i have this problem too. "OneSignal Push: there was a null error sending your notification"… -
Created a topic, Post or Preview Problem For Text Editor, on the site WordPress.org Forums:
I couldn’t post or preview. What is the problem? I c… -
Reopened ticket #30779 on Core Trac:
Call to undefined function wp_json_encode()