diff --git a/app/helpers/service_helper.py b/app/helpers/service_helper.py
index 2330d3d..dce2189 100644
--- a/app/helpers/service_helper.py
+++ b/app/helpers/service_helper.py
@@ -1,6 +1,7 @@
 import csv
 import io
 import re
+from tokenize import String
 
 def items_csv_to_dict(items_csv_reader, solver_run):
   items = []
@@ -14,10 +15,11 @@ def items_csv_to_dict(items_csv_reader, solver_run):
       item = { 'attributes': [] }
 
       # ensure that the b param is formatted correctly
-      if len(re.findall(".", row[len(headers) - 1])) >= 3:
+      if row[len(headers) - 1] != '' and is_float(row[len(headers) - 1]):
         for key, col in enumerate(headers):
           if solver_run.irt_model.formatted_b_param() == col:
-            item['b_param'] = row[key]
+            value = float(row[key])
+            item['b_param'] = value
           elif solver_run.get_constraint(col) and solver_run.get_constraint(col).reference_attribute.type == 'bundle':
             if row[key]:
               item[solver_run.get_constraint(col).reference_attribute.id] = row[key]
@@ -81,10 +83,18 @@ def solution_items(variables, solver_run):
   form_items = []
 
   for v in variables:
-    if v.varValue is not None and v.varValue > 0:
+    if v.varValue > 0 and 'Item_' in v.name:
       item_id = v.name.replace('Item_', '')
       item = solver_run.get_item(item_id)
       # add item to list and then remove from master item list
       form_items.append(item)
 
   return form_items
+
+# probably a better place for this...
+def is_float(element: String) -> bool:
+  try:
+    float(element)
+    return True
+  except ValueError:
+    return False
diff --git a/app/helpers/solver_helper.py b/app/helpers/solver_helper.py
index da6fa5c..bbd6e89 100644
--- a/app/helpers/solver_helper.py
+++ b/app/helpers/solver_helper.py
@@ -4,7 +4,7 @@ import logging
 
 from lib.errors.item_generation_error import ItemGenerationError
 
-def build_constraints(solver_run, problem, items):
+def build_constraints(solver_run, problem, items, bundles):
   try:
     total_form_items = solver_run.total_form_items
     constraints = solver_run.constraints
diff --git a/app/main.py b/app/main.py
index a69c551..4010aac 100644
--- a/app/main.py
+++ b/app/main.py
@@ -19,7 +19,7 @@ class ServiceListener(SqsListener):
     logging.info('Process complete for %s', service.file_name)
 
 def main():
-  logging.info('Starting Solver Service (v1.1.1)...')
+  logging.info('Starting Solver Service (v1.1.2)...')
   listener = ServiceListener(
     os.environ['SQS_QUEUE'],
     region_name=os.environ['AWS_REGION'],
diff --git a/app/services/loft_service.py b/app/services/loft_service.py
index 27ea599..99dd63c 100644
--- a/app/services/loft_service.py
+++ b/app/services/loft_service.py
@@ -68,6 +68,9 @@ class LoftService(Base):
       # setup vars
       items = LpVariable.dicts(
         "Item", [item.id for item in self.solver_run.items], lowBound=1, upBound=1, cat='Binary')
+      bundles = LpVariable.dicts(
+        "Bundle", [bundle.id for bundle in self.solver_run.bundles], lowBound=1, upBound=1, cat='Binary')
+
       problem_objection_functions = []
 
       # create problem
@@ -82,7 +85,7 @@ class LoftService(Base):
                     for item in self.solver_run.items]) == self.solver_run.total_form_items, 'Total form items'
 
       # dynamic constraints
-      problem = solver_helper.build_constraints(self.solver_run, problem, items)
+      problem = solver_helper.build_constraints(self.solver_run, problem, items, bundles)
 
       # multi-objective constraints
       for target in self.solver_run.objective_function.tif_targets: