Khloe Kardashian is struggling to finalize her divorce with estranged husband Lamar Odom and has been unable to make any contact with him for months, TMZ reported, citing sources. The “Keeping Up with the Kardashians” star had filed for divorce from the 35-year-old former basketball star on Dec. 13, 2013, citing “irreconcilable differences.”

The 30-year-old reality star has made numerous attempts to get in touch with Odom to finalize the terms of the divorce with their lawyers, sources reportedly said, but the former NBA player is not responding to calls from Kardashian or her attorney. Sources also said that Kardashian has been planning to file a default judgment if Odom continues to avoid meeting her to discuss the divorce, according to TMZ.

In November, reports surfaced that Odom was ready to sign the legal documents necessary to end his five-year long marriage with Kardashian. At that time, sources reportedly said that Kardashian and Odom were constantly in touch with each other.

In February, Odom had reportedly said in an interview that “only time will tell” if Kardashian would complete the divorce, which she filed after years of hiding his drug abuse and infidelity from family and friends.

Meanwhile, Kardashian reportedly admitted on Sunday night’s episode of “Kourtney and Khloe Take The Hamptons” that she may have rushed into her relationship with rapper French Montana soon after she separated from Odom.