diff --git a/sim/core/apl.go b/sim/core/apl.go
index 8f8a687b85..17a90700aa 100644
--- a/sim/core/apl.go
+++ b/sim/core/apl.go
@@ -234,6 +234,11 @@ func (apl *APLRotation) getNextAction(sim *Simulation) *APLAction {
 
 func (apl *APLRotation) shouldInterruptChannel(sim *Simulation) bool {
 	channeledDot := apl.unit.ChanneledDot
+	if channeledDot == nil {
+		// Cast was started by a different APL action (not Channel) so is non-interruptible.
+		return false
+	}
+
 	if channeledDot.MaxTicksRemaining() == 0 {
 		// Channel has ended, but apl.unit.ChanneledDot hasn't been cleared yet meaning the aura is still active.
 		return false