Scratch keeps closing

Hi, I ever posted the same question here, but my computer wasn't working for a while and the question was canceled, so I'll post again.

My Scratch keeps closing suddenly sometimes (very often), and I lose too much code with this behavior.

Here's what I have when I open Scratch on terminal, use it for a while until it closes again:

[_LOG_LEVEL_FATAL 09:33:21.355491] [Gtk] gtk_tree_selection_get_selected: assertion `GTK_IS_TREE_SELECTION (selection)' failed
[_LOG_LEVEL_FATAL 09:33:21.355563] Scratch will not function properly.
[_LOG_LEVEL_INFO 09:34:12.847517] Document.vala:95: Opening "run.sh"
[_LOG_LEVEL_INFO 09:34:13.815050] Document.vala:237: File "run.sh" saved succesfully
[_LOG_LEVEL_WARN 09:34:14.987036] [GLib-GObject] invalid cast from `(null)' to `GtkSourceCompletionProvider'
[_LOG_LEVEL_FATAL 09:34:14.987120] [GtkSourceView] gtk_source_completion_provider_populate: assertion `GTK_SOURCE_IS_COMPLETION_PROVIDER (provider)' failed
[_LOG_LEVEL_FATAL 09:34:14.987160] Scratch will not function properly.
[_LOG_LEVEL_INFO 09:34:15.316519] Document.vala:237: File "run.sh" saved succesfully
[_LOG_LEVEL_WARN 09:34:15.436588] [GLib-GObject] invalid cast from `(null)' to `GtkSourceCompletionProvider'
[_LOG_LEVEL_FATAL 09:34:15.436728] [GtkSourceView] gtk_source_completion_provider_populate: assertion `GTK_SOURCE_IS_COMPLETION_PROVIDER (provider)' failed
[_LOG_LEVEL_FATAL 09:34:15.436777] Scratch will not function properly.
[_LOG_LEVEL_WARN 09:34:15.632811] [GLib-GObject] invalid uninstantiatable type `(null)' in cast to `GtkSourceCompletionProvider'
[_LOG_LEVEL_FATAL 09:34:15.632906] [GtkSourceView] gtk_source_completion_provider_populate: assertion `GTK_SOURCE_IS_COMPLETION_PROVIDER (provider)' failed
[_LOG_LEVEL_FATAL 09:34:15.632951] Scratch will not function properly.
Segmentation fault.

Complete log: http://pastebin.com/hVC4Q7fh

I'm using the last version of elementary OS.

Thanks in advance!