Electrum crash and double spending

[vgam7]

Hi,
I'm using electrum version 2.1.1 on Gentoo. Today I was trying to send 0.13 BTC to somebody. First time, I've changed my mind on the middle of transaction - I have the option to show transaction details before broadcast. So I thought the transaction will not be actualized until I press "Broadcast" button. So I did not press it, I've just closed the dialog with the info. As I said, I was sure that the transaction wasn't made, so I did it again (to another address already), and this time I did click "Broadcast" button.

Now, when I look at this transaction on Blockchain site, it warns that it was double spent and shows ~0.27 instead of ~0.13 BTC.
Moreover, I can't start up the electrum app anymore - it crashes. The error as follows:

Traceback (most recent call last):
File "/usr/lib/python-exec/python2.7/electrum", line 254, in
gui.main(url)
File "/usr/lib64/python2.7/site-packages/electrum_gui/qt/init.py", line 224, in main
w.load_wallet(wallet)
File "/usr/lib64/python2.7/site-packages/electrum_gui/qt/main_window.py", line 216, in load_wallet
self.update_history_tab()
File "/usr/lib64/python2.7/site-packages/electrum_gui/qt/main_window.py", line 580, in update_history_tab
h = self.wallet.get_history(domain)
File "/usr/lib64/python2.7/site-packages/electrum/wallet.py", line 743, in get_history
c, u = self.get_balance(domain)
File "/usr/lib64/python2.7/site-packages/electrum/wallet.py", line 572, in get_balance
c, u = self.get_addr_balance(addr)
File "/usr/lib64/python2.7/site-packages/electrum/wallet.py", line 487, in get_addr_balance
coins = self.get_addr_utxo(address)
File "/usr/lib64/python2.7/site-packages/electrum/wallet.py", line 472, in get_addr_utxo
coins.pop(txi)
KeyError: u'[xxxxxxxxxxx]:1'

[ecdsa]

please upgrade to latest version, and report if that fixes it

[vgam7]

Latest version works fine, thanks. But can you explain what exactly happened? Why the transaction appears as "double spend"?

BTW, the 'history' tab shows that there was only one 0.13 BTC sending. Why Blockchain says 0.27 and double spend?

[ecdsa]

electrum versions lower than 2.5.1 create transactions with high-S values (google malleability)

[vgam7]

OK, thank you. So, just to be sure - is there indeed was sending double amount or just 0.13 BTC was sent as supposed to be? Who is right - blockchain, which say "0.27", or electrum, which say "0.13"?

[kyuupichan]

Blockchain is counting the "malleated" and original transactions, both of which exist but of which only one can be confirmed. So both are right, depending on how you want to look at it, but the maximum capable of being spent is just 0.13.

[vgam7]

Thank you, Neil!