Could this be the end of the Kardashian era? That is what a lot of critics are asking as it is being reported that Khloe Kardashian has just pulled out of her national book tour because of "stress" caused from an unknown illness. And while the Kardashian camp is refusing to divulge any details, many fans think Khloe pulled the plug on her tour because her new book flopped in sales.

According to the Daily Mail on Wednesday, Khloe won't be going on the road to promote her book, "Strong Looks Better Naked." The reality television star has been doing limited press as she has been spending most of her time at Lamar Odom's bedside in Los Angeles. The estranged couple temporarily halted their divorce proceedings as the former NBA star is continuing to recover after he almost died from a drug overdose at a Nevada brothel last month.

What's more, Khloe has also been going back and forth between Lamar and her boyfriend, Houston Rockets star James Harden.

And while Khloe is pulling out the sick card, no one seems to believe her as fans have their own theory.

Lamar Odom News: Kardashian Family 'Dumped' The NBA Star For Kris Jenner's Birthday?

One reader commented with, "Considering the name of this book its funny she's not Strong enough to promote it. And we don't really care so stay home," along with, "How do they know it's stress related if they don't know what it is. PR spin for sympathy because her book is a flop!"

Another critic wrote, "Kris Jenner's house is pack with her cook books, Kim's books, Jenner's books, and now few more thousands of Khloe's books."

So far, Khloe herself has not made any comments regarding the allegations. Keep up with Enstars for all the latest news on the entire Kardashian family along with all of your favorite celebrities right here.

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Khloe Kardashian