Silex recursive clone fails

gistfile1.txt

[ romain @MacBook : /tmp ] git clone --recursive https://github.com/fabpot/Silex.git 
Cloning into Silex...
remote: Counting objects: 2967, done.
remote: Compressing objects: 100% (1033/1033), done.
remote: Total 2967 (delta 1795), reused 2712 (delta 1583)
Receiving objects: 100% (2967/2967), 718.99 KiB | 458 KiB/s, done.
Resolving deltas: 100% (1795/1795), done.
Submodule 'vendor/Symfony/Component/BrowserKit' (https://github.com/symfony/BrowserKit) registered for path 'vendor/Symfony/Component/BrowserKit'
Submodule 'vendor/Symfony/Component/ClassLoader' (https://github.com/symfony/ClassLoader) registered for path 'vendor/Symfony/Component/ClassLoader'
Submodule 'vendor/Symfony/Component/CssSelector' (https://github.com/symfony/CssSelector) registered for path 'vendor/Symfony/Component/CssSelector'
Submodule 'vendor/Symfony/Component/DomCrawler' (https://github.com/symfony/DomCrawler) registered for path 'vendor/Symfony/Component/DomCrawler'
Submodule 'vendor/Symfony/Component/EventDispatcher' (https://github.com/symfony/EventDispatcher) registered for path 'vendor/Symfony/Component/EventDispatcher'
Submodule 'vendor/Symfony/Component/Finder' (https://github.com/symfony/Finder) registered for path 'vendor/Symfony/Component/Finder'
Submodule 'vendor/Symfony/Component/HttpFoundation' (https://github.com/symfony/HttpFoundation) registered for path 'vendor/Symfony/Component/HttpFoundation'
Submodule 'vendor/Symfony/Component/HttpKernel' (https://github.com/symfony/HttpKernel) registered for path 'vendor/Symfony/Component/HttpKernel'
Submodule 'vendor/Symfony/Component/Process' (https://github.com/symfony/Process) registered for path 'vendor/Symfony/Component/Process'
Submodule 'vendor/Symfony/Component/Routing' (https://github.com/symfony/Routing) registered for path 'vendor/Symfony/Component/Routing'
Submodule 'vendor/Symfony/Component/Validator' (https://github.com/symfony/Validator.git) registered for path 'vendor/Symfony/Component/Validator'
Submodule 'vendor/doctrine-common' (https://github.com/doctrine/common) registered for path 'vendor/doctrine-common'
Submodule 'vendor/doctrine-dbal' (https://github.com/doctrine/dbal) registered for path 'vendor/doctrine-dbal'
Submodule 'vendor/monolog' (https://github.com/Seldaek/monolog.git) registered for path 'vendor/monolog'
Submodule 'vendor/pimple' (https://github.com/fabpot/Pimple) registered for path 'vendor/pimple'
Submodule 'vendor/twig' (https://github.com/fabpot/Twig) registered for path 'vendor/twig'
Cloning into vendor/Symfony/Component/BrowserKit...
remote: Counting objects: 248, done.
remote: Compressing objects: 100% (152/152), done.
remote: Total 248 (delta 156), reused 188 (delta 96)
Receiving objects: 100% (248/248), 39.59 KiB, done.
Resolving deltas: 100% (156/156), done.
Submodule path 'vendor/Symfony/Component/BrowserKit': checked out 'fa6d62d0c007c07f23b70f5b6644d9e4992df408'
Cloning into vendor/Symfony/Component/ClassLoader...
remote: Counting objects: 218, done.
remote: Compressing objects: 100% (119/119), done.
remote: Total 218 (delta 132), reused 185 (delta 99)
Receiving objects: 100% (218/218), 36.96 KiB, done.
Resolving deltas: 100% (132/132), done.
Submodule path 'vendor/Symfony/Component/ClassLoader': checked out '54a1bdbe994b1f88861561b55f810e318f0edbbd'
Cloning into vendor/Symfony/Component/CssSelector...
remote: Counting objects: 259, done.
remote: Compressing objects: 100% (98/98), done.
remote: Total 259 (delta 180), reused 238 (delta 159)
Receiving objects: 100% (259/259), 47.32 KiB, done.
Resolving deltas: 100% (180/180), done.
Submodule path 'vendor/Symfony/Component/CssSelector': checked out '5a5c778ee7d27228e9eaaa43a0e8e46b42bf9f9f'
Cloning into vendor/Symfony/Component/DomCrawler...
remote: Counting objects: 274, done.
remote: Compressing objects: 100% (167/167), done.
remote: Total 274 (delta 166), reused 215 (delta 107)
Receiving objects: 100% (274/274), 50.49 KiB | 68 KiB/s, done.
Resolving deltas: 100% (166/166), done.
Submodule path 'vendor/Symfony/Component/DomCrawler': checked out '269263f7e28f2ed3fbcab047ff24252459e72371'
Cloning into vendor/Symfony/Component/EventDispatcher...
remote: Counting objects: 247, done.
remote: Compressing objects: 100% (136/136), done.
remote: Total 247 (delta 134), reused 224 (delta 111)
Receiving objects: 100% (247/247), 42.92 KiB, done.
Resolving deltas: 100% (134/134), done.
Submodule path 'vendor/Symfony/Component/EventDispatcher': checked out '716d0f5e627c66538853c0e52a3778534438b100'
Cloning into vendor/Symfony/Component/Finder...
remote: Counting objects: 229, done.
remote: Compressing objects: 100% (108/108), done.
remote: Total 229 (delta 150), reused 200 (delta 121)
Receiving objects: 100% (229/229), 36.26 KiB, done.
Resolving deltas: 100% (150/150), done.
Submodule path 'vendor/Symfony/Component/Finder': checked out 'dd56fc9f1f0baa006d7491d5c17eb3e2dd8a066c'
Cloning into vendor/Symfony/Component/HttpFoundation...
remote: Counting objects: 1756, done.
remote: Compressing objects: 100% (585/585), done.
remote: Total 1756 (delta 1191), reused 1735 (delta 1171)
Receiving objects: 100% (1756/1756), 294.60 KiB | 283 KiB/s, done.
Resolving deltas: 100% (1191/1191), done.
fatal: reference is not a tree: fa9402bd549efb52416bf0a828568997388bd86a
Unable to checkout 'fa9402bd549efb52416bf0a828568997388bd86a' in submodule path 'vendor/Symfony/Component/HttpFoundation'