diff --git a/Marlin/src/inc/SanityCheck.h b/Marlin/src/inc/SanityCheck.h
index 9bc4f0da73..cda2d0f4ba 100644
--- a/Marlin/src/inc/SanityCheck.h
+++ b/Marlin/src/inc/SanityCheck.h
@@ -1900,6 +1900,8 @@ static_assert(NUM_SERVOS <= NUM_SERVO_PLUGS, "NUM_SERVOS (or some servo index) i
     #error "DUAL_X_CARRIAGE requires X2_HOME_POS, X2_MIN_POS, and X2_MAX_POS."
   #elif X_HOME_TO_MAX
     #error "DUAL_X_CARRIAGE requires X_HOME_DIR -1."
+  #elif (X2_HOME_POS <= X1_MAX_POS) || (X2_MAX_POS < X1_MAX_POS)
+    #error "DUAL_X_CARRIAGE will crash if X1 can meet or exceed X2 travel."
   #endif
 #endif