If you try to scan (or just even look at) a Reinforced Obsidian block with a Thaumometer you're Minecaft will crash. I tested it with EnderIO Version 2.0.32 and Thaumcraft Version 4.2.3.5 and the Infinity Evolved Skyblock Modpack.

Affected Versions

• EnderIO: 2.3.0.424
• EnderCore: 0.2.0.32
• Minecraft: 1.7.10
• Forge: 10.13.4.1614

Your most recent log file where the issue was present:

http://pastebin.com/3B3iEpmP

Update EnderCore