Warnings after upgrade to 2.7.4

Object { key: "e0342709462aa9ee55b014781ca460ff", type: "notice", message: "Undefined index: hook_suffix", file: "wp-admin/includes/class-wp-screen.php", line: 223, stack: (7) […], component: "Plugin: post-expirator" }
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component: "Plugin: post-expirator"
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file: "wp-admin/includes/class-wp-screen.php"
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key: "e0342709462aa9ee55b014781ca460ff"
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line: 223
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message: "Undefined index: hook_suffix"
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stack: Array(7) [ “WP_Screen::get()”, “convert_to_screen()”, “WP_List_Table->__construct()”, … ]
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0: “WP_Screen::get()”
​​1: “convert_to_screen()”
​​2: “WP_List_Table->__construct()”
​​3: “WP_Posts_List_Table->__construct()”
​​4: “_get_list_table()”
​​5: “postexpirator_date_save_bulk_edit()”
​​6: “do_action(‘admin_init’)”
​​length: 7`

type: “notice”
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<prototype>: Object { … }`