diff --git a/Cargo.lock b/Cargo.lock
index 5285d14c2..9fc39f94b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2238,7 +2238,7 @@ dependencies = [
 [[package]]
 name = "ff_ext"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "once_cell",
  "p3",
@@ -3244,7 +3244,7 @@ dependencies = [
 [[package]]
 name = "mpcs"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "bincode 1.3.3",
  "clap",
@@ -3267,7 +3267,7 @@ dependencies = [
 [[package]]
 name = "multilinear_extensions"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "either",
  "ff_ext",
@@ -4558,7 +4558,7 @@ dependencies = [
 [[package]]
 name = "p3"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "p3-air",
  "p3-baby-bear",
@@ -5126,7 +5126,7 @@ dependencies = [
 [[package]]
 name = "poseidon"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "ff_ext",
  "p3",
@@ -6083,7 +6083,7 @@ dependencies = [
 [[package]]
 name = "sp1-curves"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "cfg-if",
  "dashu",
@@ -6208,7 +6208,7 @@ checksum = "13c2bddecc57b384dee18652358fb23172facb8a2c51ccc10d74c157bdea3292"
 [[package]]
 name = "sumcheck"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "either",
  "ff_ext",
@@ -6226,7 +6226,7 @@ dependencies = [
 [[package]]
 name = "sumcheck_macro"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "itertools 0.13.0",
  "p3",
@@ -6633,7 +6633,7 @@ dependencies = [
 [[package]]
 name = "transcript"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "ff_ext",
  "itertools 0.13.0",
@@ -6927,7 +6927,7 @@ dependencies = [
 [[package]]
 name = "whir"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "bincode 1.3.3",
  "clap",
@@ -7214,7 +7214,7 @@ dependencies = [
 [[package]]
 name = "witness"
 version = "0.1.0"
-source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.31#8b847f489031a82ed0dfd0041ea93c5e09be590e"
+source = "git+https://github.com/scroll-tech/gkr-backend.git?tag=v1.0.0-alpha.32#83cf5bb5e90a2134fc4f2778a025f1f127befbd1"
 dependencies = [
  "ff_ext",
  "multilinear_extensions",
diff --git a/Cargo.toml b/Cargo.toml
index b059df69e..3aefff457 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -27,16 +27,16 @@ version = "0.1.0"
 ceno_crypto_primitives = { git = "https://github.com/scroll-tech/ceno-patch.git", package = "ceno_crypto_primitives", branch = "main" }
 ceno_syscall = { git = "https://github.com/scroll-tech/ceno-patch.git", package = "ceno_syscall", branch = "main" }
 
-ff_ext = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "ff_ext", tag = "v1.0.0-alpha.31" }
-mpcs = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "mpcs", tag = "v1.0.0-alpha.31" }
-multilinear_extensions = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "multilinear_extensions", tag = "v1.0.0-alpha.31" }
-p3 = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "p3", tag = "v1.0.0-alpha.31" }
-poseidon = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "poseidon", tag = "v1.0.0-alpha.31" }
-sp1-curves = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "sp1-curves", tag = "v1.0.0-alpha.31" }
-sumcheck = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "sumcheck", tag = "v1.0.0-alpha.31" }
-transcript = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "transcript", tag = "v1.0.0-alpha.31" }
-whir = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "whir", tag = "v1.0.0-alpha.31" }
-witness = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "witness", tag = "v1.0.0-alpha.31" }
+ff_ext = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "ff_ext", tag = "v1.0.0-alpha.32" }
+mpcs = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "mpcs", tag = "v1.0.0-alpha.32" }
+multilinear_extensions = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "multilinear_extensions", tag = "v1.0.0-alpha.32" }
+p3 = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "p3", tag = "v1.0.0-alpha.32" }
+poseidon = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "poseidon", tag = "v1.0.0-alpha.32" }
+sp1-curves = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "sp1-curves", tag = "v1.0.0-alpha.32" }
+sumcheck = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "sumcheck", tag = "v1.0.0-alpha.32" }
+transcript = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "transcript", tag = "v1.0.0-alpha.32" }
+whir = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "whir", tag = "v1.0.0-alpha.32" }
+witness = { git = "https://github.com/scroll-tech/gkr-backend.git", package = "witness", tag = "v1.0.0-alpha.32" }
 
 anyhow = { version = "1.0", default-features = false }
 bincode = "1"
diff --git a/ceno_zkvm/src/tables/ram/ram_impl.rs b/ceno_zkvm/src/tables/ram/ram_impl.rs
index 009fefefc..39591d764 100644
--- a/ceno_zkvm/src/tables/ram/ram_impl.rs
+++ b/ceno_zkvm/src/tables/ram/ram_impl.rs
@@ -324,7 +324,9 @@ impl<DVRAM: DynVolatileRamTable + Send + Sync + Clone> DynVolatileRamTableInitCo
                             rec.addr, expected_addr,
                         );
                     }
-                    if let Some(rec) = rec_opt {
+                    if i < *num_instances
+                        && let Some(rec) = rec_opt
+                    {
                         if init_v.len() == 1 {
                             // Assign value directly.
                             set_val!(row, init_v[0], rec.init_value as u64);