Created attachment 458923 [details]
File: backtrace

Thanks for a bug report. I tried to reproduce this, but I'm not able to. Could you be more concrete with steps and/or data, please? It seems to me that it depends on the surrounding text of the link too, but I wasn't able to find the correct one. Thanks in advance.

I also can't reproduce it, i'm so sorry, i have try to do same action but not ...

Hi,
I have fond how to reproduce 

1) Create 2 new mail with html format.

2) on the first one, i copy this information on it :

Bonjour,

Voici nos photos de vacances en Jordanie :

Deux façon d'y accéder :
- Les localiser sur la carte : il suffit de cliquer sur le post-it correspondant
        http://roumano.com/images/map.php?/category/18
                - Accès direct aux photos :
        <a photo here 72px*72px>
                
Gros bisous à tous
A bientôt 

Léonie et Christian
    Sur roumano.com

3) Still on the first one, create a new line at the end of the mail
4) Select & Copy this new line (empty)
5) Paste to the second mail : evolution crash.

Regards

Thanks for the update. I see I can reproduce it too, with actual git master and slightly simpler steps:
a) open composer
b) add an empty line, select it, deselect it
c) right-click with the mouse, see the Copy action is enabled, press it
d) right-click and choose Paste.

if the above was done in plain text mode then only a critical warning is printed on the console:
> composer-CRITICAL **: e_composer_paste_text: assertion `text != NULL' failed

if in the HTML mode, then the evolution crashes with the below backtrace. The only "issue" is that it is a different crash than the initial.

#0  g_utf8_validate (str=0x0, max_len=-2, end=0x0) at gutf8.c:1784
#1  0x00007ffff6309ef4 in e_selection_data_get_html (selection_data=0x7fffffffc1b0) at e-selection.c:308
#2  0x00007ffff630a9f3 in clipboard_request_html_cb (clipboard=0x693da0, selection_data=0x7fffffffc1b0, info=0x10a9d00) at e-selection.c:658
#3  0x0000003dc2ea0eb5 in selection_received (widget=0xf06400 [GtkInvisible], selection_data=0x7fffffffc1b0, time=<value optimized out>) at gtkclipboard.c:865
#4  0x000000356160df89 in g_closure_invoke (closure=0xf579e0, return_value=0x0, n_param_values=3, param_values=0x7fff98005f20, invocation_hint=0x7fffffffbe10) at gclosure.c:766
#5  0x000000356161ee87 in signal_emit_unlocked_R (node=<value optimized out>, detail=0, instance=0xf06400, emission_return=0x0, instance_and_params=0x7fff98005f20) at gsignal.c:3252
#6  0x00000035616287b5 in g_signal_emit_valist (instance=<value optimized out>, signal_id=<value optimized out>, detail=<value optimized out>, var_args=<value optimized out>) at gsignal.c:2983
#7  0x0000003561628b6d in g_signal_emit_by_name (instance=<value optimized out>, detailed_signal=0x3dc2fb3691 "selection-received") at gsignal.c:3077
#8  0x0000003dc2dc0203 in gtk_selection_retrieval_report (info=0x7fffd400cb00, type=<value optimized out>, format=<value optimized out>, buffer=<value optimized out>, 
    length=<value optimized out>, time=20213498) at gtkselection.c:2938
#9  0x0000003dc2dc1ae5 in IA__gtk_selection_convert (widget=0xf06400 [GtkInvisible], selection=0x45, target=0x8a, time_=20213498) at gtkselection.c:1089
#10 0x00007ffff630aae0 in e_clipboard_request_html (clipboard=0x693da0, callback=0x7ffff6309860 <clipboard_wait_for_text_cb>, user_data=0x7fffffffc2f0) at e-selection.c:681
#11 0x00007ffff630acf3 in e_clipboard_wait_for_html (clipboard=0x693da0) at e-selection.c:747
#12 0x00007fffed1d8a3a in e_composer_paste_html (composer=0x11401d0 [EMsgComposer], clipboard=0x693da0) at e-composer-private.c:608
#13 0x00007fffed1dd21c in msg_composer_paste_clipboard_targets_cb (clipboard=0x693da0, targets=0x14a6750, n_targets=9, composer=0x11401d0 [EMsgComposer]) at e-msg-composer.c:1744
...

I committed a workaround for 2.32.1+ and filled an upstream bug [1] for the crash from the previous comment. I'm keeping this opened due to the initial report, where we are still looking for steps to reproduce.

[1] https://bugzilla.gnome.org/show_bug.cgi?id=634411

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