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我已经部署了一个子图。Codegen 和编译进行得很顺利，但是当我检查子图的索引状态时，我看到以下错误并且不知道该怎么做。它告诉我一个数组有洞，它应该有空值而不是这些洞？然后它似乎告诉我这四个（？）空值是如何创建的。

遇到此类错误时应该寻找什么？

  "data": {
    "indexingStatuses": [
      {
        "subgraph": "xyz",
        "synced": false,
        "health": "failed",
        "entityCount": "5",
        "fatalError": {
          "handler": null,
          "message": "Mapping aborted at ~lib/array.ts, line 110, column 40, with message: Element type must be nullable if array is holey\twasm backtrace:\t    0: 0x14db - <unknown>!~lib/@graphprotocol/graph-ts/chain/ethereum/ethereum.Value#toAddress\t    1: 0x1f06 - <unknown>!~lib/@graphprotocol/graph-ts/chain/ethereum/ethereum.SmartContract#tryCall\t    2: 0x211a - <unknown>!generated/schema/Token#set:symbol\t    3: 0x2f2e - <unknown>!src/mappings/factory/handleNewPairFromUniswap\t in handler `handleNewPair` at block #10093361 (5b5de99460c5f9b8395f69c72bbd38298389836c754de7551fde862dc49b3764)",
          "deterministic": true,
          "block": {
            "hash": "0x5b5de99460c5f9b8395f69c72bbd38298389836c754de7551fde862dc49b3764",
            "number": "10093361"
          }
        }
      }
    ]
  }
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