The US Consumer Product Safety Commission posted a recall on Adco Trading Inc.'s Peaceful Stream/Moonlit Waves Candle due to fire risk. If you have one, please return it to Dollar Tree for a full refund. Make sure to extinguish it first.
Apparently, in some cases the "flame height reached above the glass, causing the glass to break."
"ADCO Recalls Candles Due to Fire and Burn Hazards" (US CPSC)