TypeError: Cannot read property 'unsubscribe' of undefined
at SearchFormComponent.ngOnDestroy (/var/task/dist/md/server/en/main.js:3:152057)
at executeOnDestroys (/var/task/dist/md/server/en/main.js:3:3182076)
at cleanUpView (/var/task/dist/md/server/en/main.js:3:3180307)
at destroyViewTree (/var/task/dist/md/server/en/main.js:3:3178085)
at destroyLView (/var/task/dist/md/server/en/main.js:3:3180200)
at RootViewRef.destroy (/var/task/dist/md/server/en/main.js:3:3386143)
at /var/task/dist/md/server/en/main.js:3:3470163
at Array.forEach (<anonymous>)
at ApplicationRef2.ngOnDestroy (/var/task/dist/md/server/en/main.js:3:3470144)
at /var/task/dist/md/server/en/main.js:3:3245129