diff --git a/src/boris/boris2spec_app.py b/src/boris/boris2spec_app.py
index 1212708..bf2692f 100755
--- a/src/boris/boris2spec_app.py
+++ b/src/boris/boris2spec_app.py
@@ -25,7 +25,7 @@
 import argparse
 from pathlib import Path
 
-import numpy as np
+import math
 
 
 def boris2spec_app():
@@ -115,7 +115,7 @@ def boris2spec_app():
         "--hdi-prob",
         metavar="PROB",
         help="HDI prob for which interval will be computed",
-        default=np.math.erf(np.sqrt(0.5)),
+        default=math.erf(math.sqrt(0.5)),
     )
     parser.add_argument(
         "--burn",
diff --git a/src/boris/io.py b/src/boris/io.py
index 2aa02ce..4c6e97c 100644
--- a/src/boris/io.py
+++ b/src/boris/io.py
@@ -558,7 +558,8 @@ def read_dat_file(dat_file_path: Path, sim_root: Path | None = None) -> list[Sim
     sim_root = sim_root or dat_file_path.parents[0]
     with open(dat_file_path) as f:
         for line in f:
-            simulations.append(SimInfo.from_dat_file_line(line, sim_root))
+            if line.strip():
+                simulations.append(SimInfo.from_dat_file_line(line, sim_root))
     return simulations