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Here is the crash message, can anyone help me to sovle it?# Version: 7.1.0 (200.2003091736)# Issue ID: 0c524b3dc585196cbe7ed564a4d841f3# Session ID: 30ad28258bdf47d4873df879a4e534cf_DNE_0_v2# Date: 2020-03-14T08:36:00Z# OS Version: 13.3.1 (17D50)# Device: iPhone 8 Plus# RAM Free: 1.5%# Disk Free: 22.3%#0. Crashed: com.apple.main-thread0 CoreFoundation 0x1adf9e444 -[__NSDictionaryM objectForKeyedSubscript:] + 1441 CoreTelephony 0x1b2862640 -[CTTelephonyNetworkInfo updateRat:descriptor:] + 1402 CoreTelephony 0x1b2862534 -[CTTelephonyNetworkInfo queryRatForDescriptor:] + 3923 CoreTelephony 0x1b28622f0 -[CTTelephonyNetworkInfo queryRat] + 2364 CoreTelephony 0x1b285ff90 -[CTTelephonyNetworkInfo initWithClient:] + 9285 CoreTelephony 0x1b285fb90 -[CTTelephonyNetworkInfo init] + 92Here is a part of core codes:CTTelephonyNetworkInfo *telephonyNetworkInfo = [[CTTelephonyNetworkInfo alloc] init];CTCarrier *carrier = telephonyNetworkInfo.subscriberCellularProvider;NSString *serviceCarrierName = carrier.carrierName;I use telephonyNetworkInfo, which is a temporary variable, to get the carrier's name. When I need a new carrier's name, I will use CTTelephonyNetworkInfo class to initialize a new one again. Is there a problem?