Contradiction with Isaiah 36:18
This verse implies that other nations' gods could save them, implying power, whereas Isaiah 37:19 states these gods are no gods at all.
Isaiah 36:18: [Beware] lest Hezekiah persuade you, saying, The LORD will deliver us. Hath any of the gods of the nations delivered his land out of the hand of the king of Assyria?
Contradiction with Jeremiah 10:5
It emphasizes that the gods of the nations are powerless, which could suggest contradicting the mention of them being gods in Isaiah 37:19.
Jeremiah 10:5: They [are] upright as the palm tree, but speak not: they must needs be borne, because they cannot go. Be not afraid of them; for they cannot do evil, neither also [is it] in them to do good.
Contradiction with Psalm 96:5
States plainly that the gods of the nations are idols, supporting the notion they are not real, yet Isaiah 37:19 acknowledges them as gods that have been destroyed.
Psalm 96:5: For all the gods of the nations [are] idols: but the LORD made the heavens.