According to the chronicler, this verse shows that because the people turned away from God, He allowed an enemy king to take their treasures as a consequence. This teaches us that staying close to God is important because it helps protect us and our blessings.
2 Chronicles 12:9: So Shishak king of Egypt came up against Jerusalem, and took away the treasures of the house of the LORD, and the treasures of the king's house; he took all: he carried away also the shields of gold which Solomon had made.
This verse describes the same event as 2 Chronicles 12:9 without noting any significant contradiction.
1 Kings 14:25-26: And it came to pass in the fifth year of king Rehoboam, [that] Shishak king of Egypt came up against Jerusalem: