overblog/graphql-bundle JSON exception stack trace

gistfile1.txt

{
  "error": {
    "code": 500,
    "message": "Internal Server Error",
    "exception": [
      {
        "message": "Warning: mb_strlen() expects parameter 1 to be string, array given",
        "class": "Symfony\\Component\\Debug\\Exception\\ContextErrorException",
        "trace": [
          {
            "namespace": "",
            "short_class": "",
            "class": "",
            "type": "",
            "function": "",
            "file": "\/vagrant\/vendor\/webonyx\/graphql-php\/src\/Language\/Source.php",
            "line": 24,
            "args": []
          },
          {
            "namespace": "GraphQL\\Language",
            "short_class": "Source",
            "class": "GraphQL\\Language\\Source",
            "type": "->",
            "function": "__construct",
            "file": "\/vagrant\/vendor\/webonyx\/graphql-php\/src\/GraphQL.php",
            "line": 41,
            "args": [
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                "array",
                {
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              ]
            ]
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          {
            "namespace": "GraphQL",
            "short_class": "GraphQL",
            "class": "GraphQL\\GraphQL",
            "type": "::",
            "function": "executeAndReturnResult",
            "file": null,
            "line": null,
            "args": [
              [
                "object",
                "GraphQL\\Schema"
              ],
              [
                "array",
                {
                  "foo": [
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                  ]
                }
              ],
              [
                "array",
                {
                  "request_files": [
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                    "Symfony\\Component\\HttpFoundation\\FileBag"
                  ]
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              ],
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                {
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                  ]
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              ]
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          {
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            "short_class": "",
            "class": "",
            "type": "",
            "function": "call_user_func",
            "file": "\/vagrant\/vendor\/overblog\/graphql-bundle\/Request\/Executor.php",
            "line": 150,
            "args": [
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              [
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              ],
              [
                "null",
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              ]
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          },
          {
            "namespace": "Overblog\\GraphQLBundle\\Request",
            "short_class": "Executor",
            "class": "Overblog\\GraphQLBundle\\Request\\Executor",
            "type": "->",
            "function": "execute",
            "file": "\/vagrant\/vendor\/overblog\/graphql-bundle\/Controller\/GraphController.php",
            "line": 57,
            "args": [
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                "array",
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              [
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                {
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              ],
              [
                "null",
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              ]
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          {
            "namespace": "Overblog\\GraphQLBundle\\Controller",
            "short_class": "GraphController",
            "class": "Overblog\\GraphQLBundle\\Controller\\GraphController",
            "type": "->",
            "function": "processNormalQuery",
            "file": "\/vagrant\/vendor\/overblog\/graphql-bundle\/Controller\/GraphController.php",
            "line": 22,
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                "object",
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          },
          {
            "namespace": "Overblog\\GraphQLBundle\\Controller",
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            "class": "Overblog\\GraphQLBundle\\Controller\\GraphController",
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            "type": "",
            "function": "call_user_func_array",
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            "line": 153,
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            "line": 68,
            "args": [
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            "line": 168,
            "args": [
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          {
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            "file": "\/vagrant\/web\/app_dev.php",
            "line": 17,
            "args": [
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    ]
  }
}