Expression help in SSIS!!!

Hi,
I have the below expression:
ISNULL(@[User::PROCESS_DATE]) || TRIM (@[User::PROCESS_DATE]) == "" ? "1900-01-01" : (@[User::PROCESS_DATE]) == SUBSTRING(@[User::PROCESS_DATE],1,4) + "-" + SUBSTRING(@[User::PROCESS_DATE],5,2) + "-" + "1"
i get the following error:
The data types "DT_WSTR" and "DT_BOOL" are incompatible for the conditional operator
The variable Process_date is char(6) and the destination column is datetime..

SSIS JOOST,
the above expression works fine when the value is 201105 but for null or blank values its throwing an error: for empty string
ADDITIONAL INFORMATION:
Error code 0x80020005 occurred attempting to convert from data type DT_WSTR to data type DT_DBTIMESTAMP.
Casting expression "(SUBSTRING(@[User::PROCESS_DATE],1,4) + "-" + SUBSTRING(@[User::PROCESS_DATE],5,2) + "-1")" from data type "DT_WSTR" to data type "DT_DBTIMESTAMP" failed with error code 0xC00470C2.
For NULL Values:
ADDITIONAL INFORMATION:
Error code 0x80020005 occurred attempting to convert from data type DT_WSTR to data type DT_DBTIMESTAMP.
Casting expression "(SUBSTRING(@[User::PROCESS_DATE],1,4) + "-" + SUBSTRING(@[User::PROCESS_DATE],5,2) + "-1")" from data type "DT_WSTR" to data type "DT_DBTIMESTAMP" failed with error code 0xC00470C2.
I used expression editor tool for evaluating this expression

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