Programm Panics

[gregory-m]

Programm panics then decoding flowing string "|C040000000000000000000:"

panic: runtime error: makeslice: len out of range [recovered]
    panic: runtime error: makeslice: len out of range

goroutine 29 [running]:
testing.tRunner.func1(0x8203a0e10)
    /usr/local/Cellar/go/1.5/libexec/src/testing/testing.go:450 +0x171
github.com/yvasiyarov/php_session_decoder/php_serialize.(*UnSerializer).decodeString(0x82032baa0, 0x2200000022, 0x217000, 0x0, 0x0)
    /Users/gregory/Documents/gospace/src/github.com/yvasiyarov/php_session_decoder/php_serialize/unserialize.go:133 +0xe4
github.com/yvasiyarov/php_session_decoder/php_serialize.(*UnSerializer).readClassName(0x82032baa0, 0x0, 0x0)
    /Users/gregory/Documents/gospace/src/github.com/yvasiyarov/php_session_decoder/php_serialize/unserialize.go:273 +0x48
github.com/yvasiyarov/php_session_decoder/php_serialize.(*UnSerializer).decodeSerialized(0x82032baa0, 0x0, 0x0)
    /Users/gregory/Documents/gospace/src/github.com/yvasiyarov/php_session_decoder/php_serialize/unserialize.go:197 +0x42
github.com/yvasiyarov/php_session_decoder/php_serialize.(*UnSerializer).Decode(0x82032baa0, 0x0, 0x0, 0x0, 0x0)
    /Users/gregory/Documents/gospace/src/github.com/yvasiyarov/php_session_decoder/php_serialize/unserialize.go:66 +0x159
github.com/yvasiyarov/php_session_decoder.(*PhpDecoder).Decode(0x8203a7eb0, 0x82032baa0, 0x0, 0x0)
    /Users/gregory/Documents/gospace/src/github.com/yvasiyarov/php_session_decoder/decoder.go:41 +0x149
github.com/yvasiyarov/php_session_decoder.TestFuzzCrashers(0x8203a0e10)
    /Users/gregory/Documents/gospace/src/github.com/yvasiyarov/php_session_decoder/fuzz_test.go:20 +0x1fb
testing.tRunner(0x8203a0e10, 0x2b4680)
    /usr/local/Cellar/go/1.5/libexec/src/testing/testing.go:456 +0x98
created by testing.RunTests
    /usr/local/Cellar/go/1.5/libexec/src/testing/testing.go:561 +0x86d