Error occurs with the zookeeper_interest() function in version 3.5.8 of zookeeper-client-c

"I encountered an intermittent error while using zookeeper-client-c:
/lib64/libc.so.6(cfree+0x1c) [0x7f3f9e74f4dc]
/lib64/libc.so.6(_IO_free_backup_area+0x1a) [0x7f3f9e74713a]
/lib64/libc.so.6(_IO_file_overflow+0x1d5) [0x7f3f9e7468d5]
/lib64/libc.so.6(_IO_file_xsputn+0xb1) [0x7f3f9e745651]
/lib64/libc.so.6(_IO_vfprintf+0x151d) [0x7f3f9e71769d]
/lib64/libc.so.6(_IO_fprintf+0x87) [0x7f3f9e720827]
proxy(log_message+0x20c) [0x8c39d2]
proxy(zookeeper_interest+0x16b) [0x8b2c5c]
We are only using ZooKeeper for service discovery, but this error occurs every once in a while."