fix: npe in page.pause() #2745

Job	Run time
stable (ubuntu-latest, chrome)	6m 43s
stable (windows-latest, chrome)	8m 52s
stable (macos-latest, chrome)	11m 54s
stable (windows-latest, msedge)	15m 57s
stable (macos-latest, msedge)	25m 3s
dev (ubuntu-latest, firefox)	13m 28s
dev (ubuntu-latest, chromium)	7m 27s
dev (windows-latest, chromium)	6m 35s
dev (windows-latest, webkit)	8m 38s
dev (ubuntu-latest, webkit)	9m 13s
Java_21 (chromium)	6m 48s
dev (macos-latest, chromium)	8m 14s
Java_21 (firefox)	11m 38s
dev (macos-latest, firefox)	14m 45s
dev (macos-latest, webkit)	30m 39s
dev (windows-latest, firefox)	13m 34s
Java_21 (webkit)	9m 44s
	3h 29m 12s

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