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Sledge.Providers/GenericStructure.cs:635 - if reader doesn't have any more data, it returns null. String.IsNullOrWhiteSpace(null) is true, so the loop will never end. You could add something like:

if (line == null)
    throw new WhateverException("EOF trying to parse generic structure");

For reference, materials/models/gibs/combine_helicopter_gibs/combine_helicopter02.vmt from Half-Life 2: Episode Two has an extra 's' in it.

This bug still exists in the new release, the new file location is SerialisedObjectFormatter.cs:122

This example code replicates the bug:

var invalid = "Invalid\n{\ns";

var ms = new MemoryStream(Encoding.ASCII.GetBytes(invalid));
var fmt = new SerialisedObjectFormatter();
fmt.Deserialize(ms).Dump();

The invalid VMT has since been patched in HL2 EP2.