Having a rendering error I don't know how to fix (1.3.9)

[BillNye]

Sorry if this is the wrong spot to post, but my problem is with big dig, and this is a big dig forum.

Specs: Please let me know if I missed anything crucial

Java: Update 25, 64bit (pretty sure this is the problem) and 32bit

Processor: 3.6ghz Intel I7 3820

Video Card: NVidia GeForce GTX 560 Ti

OS: Windows 7

The problem I'm having is that whenever I approach a Dungeon (Better Dungeons), I freeze for a moment, and then the error report screen shows up. As I type this I'm updating my video drivers. If that does not work, I'm downgrading Java to u24.

Error log (shortened to prevent wall of text)

--- BEGIN ERROR REPORT 65b0c227 --------

Generated 7/29/13 8:38 PM

-- Head --

Stacktrace:

at net.minecraft.client.renderer.Tessellator.sortQuads(Tessellator.java:488)

at net.minecraft.client.renderer.WorldRenderer.endRenderPass(WorldRenderer.java:303)

at net.minecraft.client.renderer.WorldRenderer.func_78907_a(WorldRenderer.java:236)

at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1649)

at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1119)

-- Affected level --

Stacktrace:

at net.minecraft.client.multiplayer.WorldClient.func_72914_a(WorldClient.java:441)

at net.minecraft.client.Minecraft.func_71396_d(Minecraft.java:2414)

at net.minecraft.client.Minecraft.run(Minecraft.java:783)

at java.lang.Thread.run(Unknown Source)

-- System Details --

Details:

Minecraft Version: 1.5.2

Operating System: Windows 7 (amd64) version 6.1

Java Version: 1.7.0_25, Oracle Corporation

Java VM Version: Java HotSpot 64-Bit Server VM (mixed mode), Oracle Corporation

Memory: 383703528 bytes (365 MB) / 1216479232 bytes (1160 MB) up to 2863333376 bytes (2730 MB)

JVM Flags: 2 total; -Xmx3072m -XX:MaxPermSize=256m

AABB Pool Size: 566 (31696 bytes; 0 MB) allocated, 445 (24920 bytes; 0 MB) used

Suspicious classes: FML and Forge are installed

IntCache: cache: 0, tcache: 0, allocated: 3, tallocated: 63

java.lang.NullPointerException

at net.minecraft.client.renderer.Tessellator.sortQuads(Tessellator.java:488)

at net.minecraft.client.renderer.WorldRenderer.endRenderPass(WorldRenderer.java:303)

at net.minecraft.client.renderer.WorldRenderer.func_78907_a(WorldRenderer.java:236)

at net.minecraft.client.renderer.RenderGlobal.func_72716_a(RenderGlobal.java:1649)

at net.minecraft.client.renderer.EntityRenderer.func_78471_a(EntityRenderer.java:1119)

at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:987)

at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:871)

at net.minecraft.client.Minecraft.run(Minecraft.java:760)

at java.lang.Thread.run(Unknown Source)

--- END ERROR REPORT 98a6abaa ----------