TL;DR: spend the $19 to buy a real, big brand USB charger because they have more to lose than grey market no brand. Tragic. Probably cheap USB without mains isolation or maybe enough water dripped down length of cable and socket to create a circuit, because USB is supposed to be 5V DC. Watch these USB charger teardown horror-shows to further understand why it's rational to pay for proper, authentic CE+UL, high-low isolation and quality components (ie insulated tape in transformers): [link] [this video] [link] [link] [link] [link]
Big Clive also did a fairly comprehensive teardown of the IKEA charger and was pleasantly surprised with the design: [this video] He also confirms that the control chip is a 1699-02.
Teardown of IKEA charger with a pleasantly good design.
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