Check for isTimeAmp attribute

Check if attribute exists before reading its value

QGL/Compiler.py

@@ -609,7 +609,7 @@ def compile_sequence(seq, channels=None, edgesToCompile=None, qubitToCompile=Non
                 logger.debug("Modifying pulse on %s: %s", chan, wires[chan][-1])
                 # search for last non-TA entry
                 for ct in range(1,len(wires[chan])):
-                    if not wires[chan][-ct].isTimeAmp:
+                    if hasattr(wires[chan][-ct], 'isTimeAmp') and not wires[chan][-ct].isTimeAmp:
                         updated_frameChange = wires[chan][-ct].frameChange + block.pulses[chan].frameChange
                         wires[chan][-ct] = wires[chan][-ct]._replace(frameChange=updated_frameChange)
                         break