The following TypeError was thrown building MessageBubble dirty type Null is not a subtype of type String

Question

Type 'Null' is not a subtype of type 'String' The relevant error-causing widget was MessageBubble

i am expecting to open my chat screen but this happened. 

Answer 1

The "Type 'Null' is not a subtype of type 'String'" error occurs when you pass a null value to a widget that expects a string. To fix this error, you can add a null check or provide a default value if the value is null. You can use the null-aware operator or the null coalescing operator to handle null values.